Improvement in valve-gears for direct-acting engines



H. TESSEYMAN.

VALVE-GEAR FOR DIRECT-ACTING ENGINES.

Patented March 7, 187$ J 0 I U vent or N-PETHKS, PHQTOJJTHOGRAPHER,WASHINGTON, D Cv -NI'IED STATES:

PATENT OFFICE.

HENRY TESSEYMAN, OF SPRINGFIELD, 'OHIO.

IMPROVEMENT IN VALVE-GEARS FOR DIRECT-ACTING EN GlN ES.

Specification forming part of Letters Patent No. 1 74,590, dated March7, 1876; application filed January 12, 1876. 1

To all whom it may concern Be it known that I, HENRY TESSEYMAN, oSpringfield, Clarke county, State of Ohio, have invented an Improvementin Valve-Gear of Pumps and Engines, of which the following is aspecification:

- My invention has for its object such a construction and arrangement ofparts as that all the valve-moving. appliances, with the exception ofthe actuating-arm of the piston-rod and spring device for helping thevalve over on the ends, can be arranged in line with the valve-rod; andconsists, first, in a rotating grooved drum, operated by the arm of thepiston-rod to give a reciprocating motion to the valve through properconnections; second, in connection with said'grooved drum,

in the provision of an angularly-grooved ro- 1 tating head and slidingsocket on the valverod, having a pin to fit said groove, by which thegrooved drum is enabled to give the proper motion to the valve; third,in connection with said grooved drum, of a cam and spring device, bywhich the said drum and valve are helped over at the ends of the strokeof the piston.

Figure 1 represents my improvement attached to a steam-pump. Fig. 2 is apartlysectionized elevation of my valve-gear. Fig. 3 is an end view ofthe cam and spring device.

A and B represent, respectively, the steam and water cylinders of asteam-pump, and G the valve-actuating arm of the piston-rod thereof. Drepresents my grooved drum, having the peculiar form shown, and fittedto revolve in the bearings E E, which are secured to the frame of thepump. The pin 0 at the.

end of the actuating-arm fits into the groove 01 of the drum. Thereciprocating movement of the arm (3 gives to the drum D the rotarymovement in one direction, with a certain cessation of movement at eachhalf-revolution; and, in order to facilitate the continuation in theproper direction after each cessation, I provide a cam, F, havingtwoinclined surfaces, f, and two curved surfaces, f. In connection withthis cam I provide a rollered plunger, G, fitting into a socket, H,supported by the frame of the machine. The stem of this plunger issurrounded by a spring, I, which, pressing upon the adjustable abutmentJ, keeps the plunger against the cam at all points, the stem of theplunger being'fitted at the ends with lock-nuts to regulate the force ofthe roller against the cam.

The provision of the adjustable abutment and adjustable nuts K enablesthe operator to adjust the tension of the spring without necessarilychanging the pressure of the roller against the lowest part of the cam.v

The action of the rollered plunger, after it reaches the highestprominence of the cam, serves, while sliding downthe parts f, by theretraction of the spring at those times, toso move the drum at the endsof the stroke in its proper direction of rotation.

At the valve end of the shaft of the drum D I provide a head, L, havinga groove, l, which is cut in an inclined plane with relation-to the faceof the heads, so that, in revolving, it will give a reciprocating motionto the sliding head M,-to which it connects by means of aninteriorly-projecting pin, N, fitting into the groove l.

The reciprocation of the head M, held-to a proper line by slide m, givesthe proper motion to the valve 0, which is of the ordinary kind, andfitted within the ordinary valvechest of the steam-cylinder.

By this arrangement of parts it will be seen that there are noreciprocating parts excepting the spring-plunger and the arm 0, thelatter running in guides P, and that the principal parts of thevalve-gear continue in one direction, and are all arranged in line withthe valve itself, without the intervention of any levers or otherobjectionable contrivances and the pump, therefore, is put up in acompact form, and is necessarily of a durable character.

I claim- 1. The combination, substantially as specified, of theactuating-arm, the grooved drum,

and a separate means for imparting a slight turn to the drum at the endof each stroke of the actuating-arm, thus insuring the continuousrotation of said drum for giving a reciprocating movement to the valvethrough proper connections.

2. In combination with the arnl G c and. drum D d, the grooved head L land reciproeating valve-head M N, operated substantially as and for thepurpose specified.

3. In combination with the arm 0 c and valve-moving drum D d, the cam Fand; spring-plunger G, operating substantially as and for the purposespecified.

In testimony of which invention I hei'eunto 'set my-hand.

